The original silk battle flag reproduced here is found in the NYS Military Museum and Veterans Research Center in Saratoga.  This is a regimental flank marker of the 91st Regiment of NY Volunteers, which was recruited from the Albany Capital District area from 1861 – 1865. A photograph of the original can be found at https://dmna.ny.gov/historic/btlflags/infantry/91stInfMarker.htm